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The Single UNIX &reg; Specification, Version 2<br>
Copyright &copy; 1997 The Open Group

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<h4><a name = "tag_000_009_471">&nbsp;</a>NAME</h4><blockquote>
tcgetpgrp - get the foreground process group ID
</blockquote><h4><a name = "tag_000_009_472">&nbsp;</a>SYNOPSIS</h4><blockquote>
<pre><code>

#include &lt;<a href="systypes.h.html">sys/types.h</a>&gt;
#include &lt;<a href="unistd.h.html">unistd.h</a>&gt;

pid_t tcgetpgrp(int <i>fildes</i>);
</code>
</pre>
</blockquote><h4><a name = "tag_000_009_473">&nbsp;</a>DESCRIPTION</h4><blockquote>
The
<i>tcgetpgrp()</i>
function will return the value of the process group ID of the
foreground process group associated with the terminal.
<p>
If there is no foreground process group,
<i>tcgetpgrp()</i>
returns a value greater than 1 that does not match the process group ID of any
existing process group.
<p>
The
<i>tcgetpgrp()</i>
function is allowed from a process that is a member of a
background process group; however, the
information may be subsequently changed by a process that is a
member of a foreground process group.
</blockquote><h4><a name = "tag_000_009_474">&nbsp;</a>RETURN VALUE</h4><blockquote>
Upon successful completion,
<i>tcgetpgrp()</i>
returns the value of the process group ID of the foreground process
associated with the terminal.  Otherwise, -1 is returned and
<i>errno</i>
is set to indicate the error.
</blockquote><h4><a name = "tag_000_009_475">&nbsp;</a>ERRORS</h4><blockquote>
The
<i>tcgetpgrp()</i>
function will fail if:
<dl compact>

<dt>[EBADF]<dd>
The
<i>fildes</i>
argument is not a valid file descriptor.

<dt>[ENOTTY]<dd>
The calling process does not have a controlling terminal,
or the file is not the controlling terminal.

</dl>
</blockquote><h4><a name = "tag_000_009_476">&nbsp;</a>EXAMPLES</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_477">&nbsp;</a>APPLICATION USAGE</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_478">&nbsp;</a>FUTURE DIRECTIONS</h4><blockquote>
None.
</blockquote><h4><a name = "tag_000_009_479">&nbsp;</a>SEE ALSO</h4><blockquote>
<i><a href="setsid.html">setsid()</a></i>,
<i><a href="setpgid.html">setpgid()</a></i>,
<i><a href="tcsetpgrp.html">tcsetpgrp()</a></i>,
<i><a href="systypes.h.html">&lt;sys/types.h&gt;</a></i>,
<i><a href="unistd.h.html">&lt;unistd.h&gt;</a></i>.
</blockquote><h4>DERIVATION</h4><blockquote>
Derived from the POSIX.1-1988 standard.
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UNIX &reg; is a registered Trademark of The Open Group.<br>
Copyright &copy; 1997 The Open Group
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